Ever heard of the Hawthorne Effect?
I hope the people evaluating this are aware of the Hawthorne Effect where it was determined that increases in productivity were not down to changes in the environment (which included lighting changes), but the special attention the subjects were getting.
Of course people are now well aware that the original experiment (and the conclusions drawn) we somewhat flawed. However, the basic Hawthorne Effect is very well accepted.
This does not mean that environmental issues don't make a difference, but it's a good reason to be suspicious of press releases and *research* from interested parties.